Granted Patent
Utility
US 4,953,583 · App. 07/328,451
Tank pressure control valve
Inventor:
Emil Szlaga
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Mar 24, 1989
Inventor
Emil Szlaga
Assignee (at issue)
Stant Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.